A new poll found Donald Trump falling behind in a key state

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Cruz Courts Female Vote in Wisconsin

Republican presidential frontrunner Donald Trump is falling behind in Wisconsin, according to a new poll from Marquette Law School released on Wednesday.

Trump trailed Sen. Ted Cruz by 10 points in the survey. The real-estate magnate attracted 30 percent support among likely voters. Cruz's support was at 40 percent and Ohio Gov. John Kasich was at 21 percent.

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It's a big difference from last month's Marquette poll. When that was released in mid-February, Trump led Cruz by 11 points.

PHOTOS: Ted Cruz on the campaign trail

41 PHOTOS
Ted Cruz on the campaign trail
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A new poll found Donald Trump falling behind in a key state
STAFFORD-MARCH 1: Ted Cruz holds his victory rally at the Redneck Country Club in Stafford, Texas. On the left is his wife, Heidi and their two daughters and on the right is the Lt. Governor of Texas, Dan Patrick. (Photo by Lucian Perkins /for The Washington Post via Getty Images)
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, stands on stage during a Super Tuesday night event in Houston, Texas, U.S., on Tuesday, March 1, 2016. Cruz said Monday in Dallas that Super Tuesday will make the Republican primary a 'two-man race,' predicting that he and Donald Trump will finish far ahead of rivals Marco Rubio, John Kasich and Ben Carson in terms of delegates. Photographer: Matthew Busch/Bloomberg via Getty Images
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, greets attendees with his wife Heidi Cruz and children during a campaign event in San Antonio, Texas, U.S., on Monday, Feb. 29, 2016. Cruz said Monday in Dallas that Super Tuesday will make the Republican primary a 'two-man race,' predicting that he and Donald Trump will finish far ahead of rivals Marco Rubio, John Kasich and Ben Carson in terms of delegates. Photographer: Matthew Busch/Bloomberg via Getty Images *** Local Captions *** Ted Cruz; Heidi Cruz
US Republican presidential hopeful Sen. Ted Cruz speaks at a presidential campaign rally in Dallas, Texas on February 29, 2016 one day before the 'Super Tuesday' primaries. Americans in a dozen states head to the polls for a slew of primaries and caucuses March 1 on what is considered the most important day of the presidential nominations calendar. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
UNITED STATES - FEBRUARY 27: Presidential candidate Sen. Ted Cruz, R-Texas, arrives for a campaign rally near the Georgia State Capitol Building in Atlanta, Ga., February 27, 2016. (Photo By Tom Williams/CQ Roll Call)
HOUSTON, TX - FEBRUARY 24: Republican presidential candidate U.S. Sen Ted Cruz (R-TX) greets people during a campaign rally at the Mach Industrial Group on February 24, 2016 in Houston, Texas. The process to select the next Democratic and Republican Presidential candidates continues. (Photo by Joe Raedle/Getty Images)
AMES, IA - JANUARY 30: Republican presidential candidate Sen. Ted Cruz (R-TX) arrives at a campaign event at the Gateway Hotel on January 30, 2016 in Ames, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)
DES MOINES, IA - JANUARY 31: Republican presidential candidate Sen. Ted Cruz (R-TX) speaks to Iowa voters at the Iowa State Fairgrounds January 31, 2016 in Des Moines, Iowa. The U.S. presidential election kicks off tomorrow with the state's caucuses. (Photo by Win McNamee/Getty Images)
HAMLIN, IA - JANUARY 30: Republican presidential candidate Sen. Ted Cruz (R-TX) speaks at a campaign event at Darrell's Place on January 30, 2016 in Hamlin, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)
HAMLIN, IA - JANUARY 30: Republican presidential candidate Sen. Ted Cruz (R-TX) (C) greets an audience member as he is introduced at a campaign event at Darrell's Place on January 30, 2016 in Hamlin, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)
Republican presidential candidate, Sen. Ted Cruz, R-Texas speaks during a campaign stop at the Freedom Country Store, Tuesday, Jan. 19, 2016, in Freedom, N.H. (AP Photo/John Minchillo)
Republican presidential candidate, Sen. Ted Cruz, R-Texas, departs a campaign stop, Monday, Jan. 18, 2016, in Washington, N.H. (AP Photo/Matt Rourke)
Shown is Republican presidential candidate, Sen. Ted Cruz, R-Texas, shadow as he speaks during a campaign stop Wednesday, Jan. 20, 2016, in Hollis, N.H. (AP Photo/Matt Rourke)
Delaney Anne tries to make a selfie with Republican presidential candidate, Sen. Ted Cruz, R-Texas, during a campaign stop, Monday, Jan. 18, 2016, in Tilton, N.H. (AP Photo/Matt Rourke)
Republican Presidential candidate Sen. Ted Cruz, R-Texas, campaigns at Penny's Diner in Missouri Valley, Iowa, Monday, Jan. 4, 2016. (AP Photo/Nati Harnik)
LAS VEGAS, NV - DECEMBER 17: Republican presidential candidate Sen. Ted Cruz (R-TX) speaks during a campaign rally at the Siena Community Center on December 17, 2015 in Las Vegas, Nevada. Two days after participating in the fifth GOP presidential debate, Cruz began a swing through eight Super Tuesday states in five days. (Photo by Ethan Miller/Getty Images)
Republican presidential candidate Sen. Ted Cruz, R-Texas, speaks during a town hall meeting at Furman University on Monday, Dec. 7, 2015, in Greenville, S.C. (AP Photo/Rainier Ehrhardt)
Republican presidential candidate Sen. Ted Cruz, R-Texas, speaks Saturday, Dec. 5, 2015, during the Rising Tide Summit at the US Cellular Center in Cedar Rapids, Iowa. (AP Photo/Scott Morgan)
Republican presidential candidate Sen. Ted Cruz, R-Texas speaks to supporters on the Statehouse steps in Concord, N.H., Thursday, Nov. 12, 2015, after filing papers to be on the nation's earliest presidential primary ballot. (AP Photo/Jim Cole)
WASHINGTON, DC - DECEMBER 03: Republican presidential candidate Sen. Ted Cruz (R-TX) leads a moment of silence for victims of the San Bernardino shooting prior to his address to the Republican Jewish Coalition at Ronald Reagan Building and International Trade Center December 3, 2015 in Washington, DC. Candidates spoke and took questions from Jewish leaders and activists. (Photo by Alex Wong/Getty Images)
Republican presidential candidate Sen. Ted Cruz, R-Texas, shops for jewelry from ChildVoice International with his daughters Catherine, left, and Caroline during a campaign stop at the Deerfield Fair Friday, Oct. 2, 2015, in Deerfield, N.H. ChildVoice International is a non-profit organization seeking to restore the voices of children silenced by war.(AP Photo/Jim Cole)
Republican Presidential candidate Donald Trump, right, speaks with fellow Republican presidential candidate Sen. Ted Cruz, R-Texas, during a rally opposing the Iran nuclear deal outside the Capitol in Washington, Wednesday, Sept. 9, 2015. (AP Photo/Susan Walsh)
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, speaks during a Tea Party Patriots rally against the Iran nuclear deal on Capitol Hill in Washington, D.C., U.S., on Wednesday, Sept. 9, 2015. A revolt among U.S. House Republicans delayed action on the Iran nuclear deal today as some members insisted they aren't bound by a Sept. 17 deadline in their efforts to kill the agreement. Photographer: Andrew Harrer/Bloomberg via Getty Images
Republican presidential candidate Texas Sen. Ted Cruz, center, right, posses for a photo with Timothy Lewis after a campaign event at the Stockyards in Forth Worth, Texas, Thursday, Sept. 3, 2015. (AP Photo/LM Otero)
Photographed through attendees, Republican presidential candidate, Sen. Ted Cruz, R-Texas, speaks at the Americans for Prosperity Road to Reform event Friday, Aug. 14, 2015, in Las Vegas. (AP Photo/John Locher)
DES MOINES, IA - AUGUST 21: Republican presidential candidate Sen. Ted Cruz (R-TX) speaks to supporters at his Religious Liberty Rally on August 21, 2015 in Des Moines, Iowa. Earlier in the day Republican presidential candidate Sen. Ted Cruz (R-TX) visited and spoke to guests at the Iowa State Fair. (Photo by Scott Olson/Getty Images)
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, speaks at the Iowa State Fair Soapbox in Des Moines, Iowa, U.S., on Friday, Aug. 21, 2015. A day after Jimmy Carter appeared on national television to talk about the cancer that's ravaging his body, Cruz criticized the former president's administration in a speech in Iowa. Photographer: Daniel Acker/Bloomberg via Getty Images
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, eats a pork chop at the Iowa Pork Producers tent during the Iowa State Fair in Des Moines, Iowa, U.S., on Friday, Aug. 21, 2015. A day after Jimmy Carter appeared on national television to talk about the cancer that's ravaging his body, Cruz criticized the former president's administration in a speech in Iowa. Photographer: Daniel Acker/Bloomberg via Getty Images
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, speaks at the Rally for Religious Liberty in Des Moines, Iowa, U.S., on Friday, Aug. 21, 2015. A day after Jimmy Carter appeared on national television to talk about the cancer that's ravaging his body, Republican presidential candidate Cruz criticized the former president's administration in a speech in Iowa. Photographer: Daniel Acker/Bloomberg via Getty Images
UNITED STATES - AUGUST 8: Presidential candidate Sen. Ted Cruz (R-TX) spends a few moments with his daughter Catherine before the start of the Cruz bus tour rally in a field behind Sprayberry's BBQ in Newnan, Ga., on Saturday, Aug. 8, 2015. (Photo By Bill Clark/CQ Roll Call)
Texas Senator Ted Cruz participates in the Republican presidential primary debate on August 6, 2015 at the Quicken Loans Arena in Cleveland, Ohio. AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
UNITED STATES - JULY 29: Sen. Ted Cruz, R-Texas, awaits for the elevator doors to close as he arrives in the basement of the Capitol, July 29, 2015. (Photo By Al Drago/CQ Roll Call)
WASHINGTON, DC - JULY 28: Republican presidential candidate, U.S. Sen. Ted Cruz (R-TX) speaks during a Anti-abortion rally opposing federal funding for Planned Parenthood in front of the U.S. Capitol July 28, 2015 in Washington, DC. Sen. Rand Paul (R-KY) announced a Senate deal to vote on legislation to defund Planned Parenthood before the Senate goes into recess in August. (Photo by Olivier Douliery/Getty Images)
Sen. Ted Cruz, R-Texas, speaks to reporters following a rare Sunday Senate session on Capitol Hill in Washington, Sunday, July 26, 2015. Senior Senate Republicans lined up Sunday to rebuke Cruz for attacking Majority Leader Mitch McConnell, an extraordinary display of intraparty division played out live on the Senate floor. (AP Photo/Manuel Balce Ceneta)
WASHINGTON, USA - JULY 23: Republican Presidential Candidate Senator Ted Cruz speaks out against the nuclear deal with Iran during a demonstration that was interrupted by counter protestors in Lafayette Park across the the street from the White House in Washington, DC on July 23, 2015. (Photo by Samuel Corum/Anadolu Agency/Getty Images)
Senator Ted Cruz, a Republican from Texas and 2016 U.S. presidential candidate, speaks during The Family Leadership Summit in Ames, Iowa, U.S., on Saturday, July 18, 2015. The sponsor, The FAMiLY LEADER, is a 'pro-family, pro-marriage, pro-life organization which champions the principle that God is the ultimate leader of the family.' Photographer: Daniel Acker/Bloomberg via Getty Images
AMES, IA - JULY 18: Republican presidential hopeful Senator Ted Cruz of Texas fields questions at The Family Leadership Summit at Stephens Auditorium on July 18, 2015 in Ames, Iowa. According to the organizers the purpose of The Family Leadership Summit is to inspire, motivate, and educate conservatives. (Photo by Scott Olson/Getty Images)
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, stands outside while waiting to speak during the Faith and Freedom Coalition's 'Road to Majority' legislative luncheon in Washington, D.C., U.S., on Thursday, June 18, 2015. The annual Faith & Freedom Coalition Policy Conference gives top-tier presidential contenders as well as long shots a chance to compete for the large evangelical Christian base in the crowded Republican primary contest. Photographer: Andrew Harrer/Bloomberg via Getty Images
WASHINGTON, DC - JUNE 04: Sen. Ted Cruz (R-TX) participates in a Judiciary Subcommittee hearing on the Affordable Care Act on Capitol Hill June 4, 2015 in Washington, DC. The hearing is billed as 'Rewriting The Law, Examining the Process That Led to the ObamaCare Subsidy Rule'. (Photo by Mark Wilson/Getty Images)
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, speaks during a press conference at the Hampton Inn and Suites in Seneca, South Carolina, U.S., on Wednesday, Feb. 17, 2016. Cruz says Donald Trump sent his lawyers cease and desist letters over a Cruz campaign ad that portrays Trump as pro-choice saying that if the Cruz campaign doesn't pull ad, they'll see immediate legal action to prevent the continued broadcast of this ad, according to Cruz. Photographer: Daniel Acker/Bloomberg via Getty Images
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While Trump support has remained steady at 30 percent, Cruz's shot up in the new survey, doubling from 19 percent to 40 percent in just more than one month.

The Wednesday survey came after the GOP field dwindled to three remaining candidates. The Marquette Law School poll is widely respected among political observers.

Wisconsin's primary, which will be held next week, is the only GOP contest on the calendar before the New York primary on April 19. It awards 42 delegates, and many in the "Never Trump" movement view it as a final stand to stop the GOP frontrunner.

Cruz and Trump are campaigning aggressively to win the state. Cruz is touting his recent endorsement from Wisconsin Gov. Scott Walker, a former presidential candidate. Trump has scheduled campaign events throughout the week in the Badger State.

Related: Scenes from an anti-Trump rally in Wisconsin:

19 PHOTOS
Wisconsin Anti-Trump Rally
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A new poll found Donald Trump falling behind in a key state
Protesters demonstrate outside a campaign rally for Republican U.S. presidential candidate Donald Trump in Janesville, Wisconsin, March 29, 2016. REUTERS/Kamil Krzaczynski
Protesters demonstrate outside a campaign rally for Republican U.S. presidential candidate Donald Trump in Janesville, Wisconsin, March 29, 2016. REUTERS/Kamil Krzaczynski
UNITED STATES - MARCH 29: Anti-Trump protesters gather in the free speech zone outside of the Janesville Conference Center in Janesville, Wis., in advance of the Donald Trump for President rally in Speaker of the House Paul Ryan's home town on Tuesday, March 29, 2016. (Photo By Bill Clark/CQ Roll Call)
Anti-Trump protesters demonstrate outside a campaign event for Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, not pictured, in Janesville, Wisconsin, U.S., on Tuesday, March 29, 2016. Trump began his closing bid to capture Wisconsin's winner-take-all Republican primary by trying to address one of the biggest vulnerabilities of his campaign for the presidency: the female vote. Photographer: Luke Sharrett/Bloomberg via Getty Images
UNITED STATES - MARCH 29: A Trump supporter debates with anti-Trump protesters in the free speech zone outside of the Janesville Conference Center in Janesville, Wis., in advance of the Donald Trump for President rally in Speaker of the House Paul Ryan's home town on Tuesday, March 29, 2016. (Photo By Bill Clark/CQ Roll Call)
Anti-Trump protesters demonstrate outside a campaign event for Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, not pictured, in Janesville, Wisconsin, U.S., on Tuesday, March 29, 2016. Trump began his closing bid to capture Wisconsin's winner-take-all Republican primary by trying to address one of the biggest vulnerabilities of his campaign for the presidency: the female vote. Photographer: Luke Sharrett/Bloomberg via Getty Images
JANESVILLE, WI - MARCH 29: Demonstrators protest outside a campaign rally for Republican presidential candidate Donald Trump at the Holiday Inn Express hotel on March 29, 2016 in Janesville, Wisconsin. Wisconsin voters go to the polls for the state's primary on April 5. (Photo by Scott Olson/Getty Images)
JANESVILLE, WI - MARCH 29: Demonstrators protest outside a campaign rally for Republican presidential candidate Donald Trump at the Holiday Inn Express hotel on March 29, 2016 in Janesville, Wisconsin. Wisconsin voters go to the polls for the state's primary on April 5. (Photo by Scott Olson/Getty Images)
JANESVILLE, WI - MARCH 29: Demonstrators protest outside a campaign rally for Republican presidential candidate Donald Trump at the Holiday Inn Express hotel on March 29, 2016 in Janesville, Wisconsin. Wisconsin voters go to the polls for the state's primary on April 5. (Photo by Scott Olson/Getty Images)
JANESVILLE, WI - MARCH 29: Demonstrators and supporters of Republican presidential candidate Donald Trump wait for the start of a campaign rally at the Holiday Inn Express hotel on March 29, 2016 in Janesville, Wisconsin. Wisconsin voters go to the polls for the state's primary on April 5. (Photo by Scott Olson/Getty Images)
JANESVILLE, WI - MARCH 29: Demonstrators protest outside a campaign rally for Republican presidential candidate Donald Trump at the Holiday Inn Express hotel on March 29, 2016 in Janesville, Wisconsin. Wisconsin voters go to the polls for the state's primary on April 5. (Photo by Scott Olson/Getty Images)
JANESVILLE, WI - MARCH 29: Demonstrators protest outside a campaign rally for Republican presidential candidate Donald Trump at the Holiday Inn Express hotel on March 29, 2016 in Janesville, Wisconsin. Wisconsin voters go to the polls for the state's primary on April 5. (Photo by Scott Olson/Getty Images)
Demonstrators gather outside the Holiday Inn Express in Janesville, Wis., Tuesday, March 29, 2016, to protest a scheduled appearance by Republican presidential candidate Donald Trump at the adjoining conference center , (AP Photo/Nam Y. Huh)
Donald Trump protesters argue with a supporter outside the Holiday Inn Express in Janesville, Wis., Tuesday, March 29, 2016, prior to a scheduled appearance by Republican presidential candidate Donald Trump. (AP Photo/Nam Y. Huh)
Demonstrators gather outside the Holiday Inn Express in Janesville, Wis., Tuesday, March 29, 2016, to protest the scheduled appearance of Republican presidential candidate Donald Trump at the adjoining conference center . (AP Photo/Nam Y. Huh)
Demonstrators gather outside the Holiday Inn Express in Janesville, Wis., Tuesday, March 29, 2016, to protest a scheduled appearance by Republican presidential candidate Donald Trump at the adjoining conference center , (AP Photo/Nam Y. Huh)
Protesters demonstrate outside a campaign rally for Republican U.S. presidential candidate Donald Trump in Janesville, Wisconsin, March 29, 2016. REUTERS/Kamil Krzaczynski
Donald Trump protesters hold a sign outside the Holiday Inn Express in Janesville, Wis., Tuesday, March 29, 2016, to protest Republican presidential candidate Donald Trump's scheduled appearance. (AP Photo/Nam Y. Huh)
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